Burner for liquid fuel.



F. S. MOKIBBEN.

BURNER FOR LIQUID FUEL.

APPLICATION I'ILED AUG. 28, 1908.

Patented June 28, 1910.

j 2/1/67 ztoft' FRANK S. MOKIBIBEN, 0F MEIVIPHIS, NEBRASKA.

BURNER FOR LIQUID FUEL.

Application filed. August 28, 1908.

Specification of Letters Patent.

Patented June 28, 1910.

Serial No. 450,785.

To all whom it may concern:

Be it known that I, FRANK S. MOKIBBEN, a citizen of the United States, residing at Memphis, in the county of Saunders and the State of Nebraska, have invented certain new and useful Improvements in the Construction of Burners for Liquid Fuel.

The object of this invention is to provide means for burning liquid fuel by which a smokeless flame will be produced and by which the quantity of air and fuel used may be gaged to be large or small according to the need of the moment, but always in proper proportion to each other.

The invention is based on the fact that gasolene or other liquid fuel will burn without producing smoke or soot if slowly fed to the fire and if, at the same time, it be minutely subdivided or atomized by a strong current of air with which it becomes mixed. Since atomization is complete whether the fuel be used in large or small quantity, this burner may also be advantageously used where a variable flame is desired and when steam is the atomizing agent and atmospheric air is admitted to the furnace at another place.

The invention consists primarily of a burner composed of two concentric tubes, an outer one which receives compressed air from any suitable source and an inner one which receives oil from any suitable source. The air and oil meet in the outlet of the burner wherethe force ofcthe former atomizes the latter and the two are mixed together. The oil tube is made so that it may be rotated to a limited extent. By this rotation the size of the outlet is made smaller or larger at the will of the operator, thereby regulating the supply of fuel and air.

Referring to the accompanying drawings which are part of this specification, Figure 1 is an end elevation of the burner and connected parts. Fig. 2 is a vertical longitudinal section through the tubes of the burner when the outlets are open. Fig. 3 is a plan of the oil tube. Fig. 4 is an end elevation of the same. Fig. 5 is an end elevation of the outer tube or casing, showing the outlet for the mixed air and fuel. Fig. 6 is a section of the outer casing a short distance within its outlet, on the line 6 of Fig. 2. Fig. 7 is a section of both tubes in the plane of the oil outlet, on the line 7 of Fig. 2, when the outlets are fully open, as in Fig. 2. Fig. 8 is a like section when the oil tube is rotated so as almost to close the outlets for both air and fuel. Figs. 5, 6, 7 and 8 represent the parts as if observed from within the furnace or combustion chamber.

Referring, now, by number, to the separate parts, the outer tube or air casing, 1, of the burner is fixed immovably in the wall of the furnace or combustion chamber and receives compressed air through the pipe, 2. This casing is bored to receive the oil tube, 8, the boring being large enough for an annular air space between the oil tube and the casing. The inner end of the casing, 1, is closed except that there is an outlet, 4, for the passage of the air and atomized fuel, the upper or outer curve of which coincides with the interior boring, and the lower side of which is below the level of the upper surface of the oil tube. At the end of the outlet, 4, and extending a short distance into the annular air space, there is a flange-like projection, 5, which extends around one-fourth of the inner circumference of the air casing, which fits against the curved surface of the oil tube. A ring, 6, is fixed to, or formed upon, the oil tube which fits in the open end of the outer casing, 1, and closes the annular air space. A bushing, 7, screws into the casing and bears upon the ring, thus holding the oil tube in place. Near the end of the oil tube, there is a narrow transverse slot, 8. Through this slot, the fuel passes from the tube into the passage or outlet, 4, in a thin flat stream, across which, the air passes with sufficient force to atomize it.

The oil port, 8, occupies a little less than one-fourth of the circumference of the tube. A portion of a ring, 9, extending about half way around, is fixed to, or formed upon, the tube at the end of the oil port and flush with the end of the tube. Otherwise it is of the same dimensions as the ring, 6. This half ring is thus in the same plane with the projection, 5, which projects from the interior of the casing, 1. On the oil tube, outside the casing, a lever or handle, 10, is fixed (by a set screw or otherwise) by which the tube is rotated. Outside the lever, 10, the oil tube passes into a casing, 11, in which the. oil supply pipe, 12, ends. A flange or ring, 13, is screwed on the end of the oil tube to bear upon the inner surface of the casing, 11. The outer end of the casing is closed by a plug, 14. The connection between the oil tube and the casing, 11, may be made in one of several other ways that will be oil tight while permitting rotation suitable source, as from an oil chamber or tank or direct from a force pump.

When the oil tube, 3, is placed as shown in Fig. 7, the oil port, 8, is directly within the outlet, 4:, and the current of air passes over it throughout its entire length. When the tube is rotated, the oil port passes under the flange-like projection, 5, which cuts off the flow of oil to that extent, and at the same time, the half ring, 9, approaches the projection, 5, at its end and closes the air channel to a like extent. Thus the outlets for air and for fuel are made smaller or larger in exact proportion to each other and the full proportional amount of air, with full strength of current, passes over a small flow of fuel as well as the largest, thereby atomizirlllg a small or a large quantity equally we Havingdescribed my invention, I claim as new: Y

1. In a liquid fuel burner, the combination of two concentric tubes, the outer one, for conveying an atomizing agent, having an outlet in its'end, and the inner one, .for con veying the fuel, having an outlet near its end and rotatable to a limited extent in said outer tube for the purpose of increasing or diminishing the areas of said outlets.

in its end, a curved projection therein, a fuel tube rotatable to a limited extent in said air casing and bearing upon the inner curve of .said projection, a ring on said tube to close one end of said casing, a half ring formed on the end of said fuel tube and moved, by the rotation thereof, in the plane of said projection, to open or close the outlet of said air casing and a transverse outlet from the fuel tube into the air'casing in the plane of said half ring and said projection whereby the areas of the air and fuel outlets are increased or diminished in a constant ratio by the rotation of the fuel tube.

3. In an apparatus for burning liquid fuel the combination of an outer air casingvhaving an outlet in its end, a compressed air supply pipe, a fuel supply pipe, a fuel casing fixed on the end thereof, a fuel tube having an outlet near its end and rotatable to a limited extent in said air casing and in said fuel casing, by which rotation the areas of said 7 FRANK S. MCKI'BBEN.

a Witnesses:

J. O. EHLERS, I-I. Woonnm. 

